598 SUPPLEMENT. 
There is a still larger one, 52 millim. in diameter, among those found at Coban by 
Salvin; hence the measurements given in the comparative table (anted, p. 2) require 
modification. 
Cyclophorus (Amphicyclotus) maleri (p. 6). 
Cyclophorus maleri, Pilsbry, Proc. Acad. Phil. 1892, p. 338 °. 
To the localities given, add :— 
Hab. S.E. Muxico: Mountains of Poana, Tabasco (Rovirosa ®). 
The general habitat was incorrectly given on p. 6 as S.W. Mexico. 
Cyclophorus (Amphicyclotus) texturatus (p. 6). 
Var. goldfussi. 
Amphicyclotus goldfussi, Bottger, Nachrichtsblatt d. deutsch. malak. Ges. 1892, p. 203°. 
Very similar to the normal form, but with 6 whorls, and the measurements somewhat different: Diam. 
maj. 51, alt. 28, apert. 21 millim. (in the largest specimens of C. tevturatus from N. Guatemala: 45, 
204, 19). 
Hab. Honpuras: San Pedro Sula, in the north-western portion of Honduras 8. 
5 (a). Cyclophorus (Amphicyclotus) underwoodi. 
Cyclophorus underwoodi, 8. F. da Costa, Proc. Mal. Soc. London, iv. p. 67, t. 7. figg. 5-8 (1900) ?. 
Depressed, spirally ridged, chestnut-brown above, pale greenish below, with a chestnut-brown band below the 
periphery ; suture somewhat channelled ; aperture very oblique, peristome straight, notched in the middle 
of the parietal callosity. 
Diam. maj. 45, min. 32, alt. 30 millim. 
Hab. N.W. Costa Rica: Carillo (Underwood 1). 
Near C. cumingi, Sow., from Colombia. 
Cyclophorus (?) giganteus (p. 8). 
Cyclotus giganteus, antea, p. 8. | 
This species is mentioned by Boucard among the shells from Vera Paz (N. Guatemala) 
exhibited in the Universal Exposition at Paris, 1878 (Bull. Soc. Zool. Fr. iii. p. 170), 
probably an error in determination, as C. giganteus has not been recorded by anyone 
else from so far north as Guatemala. 
CHOANOPOMA (p. 13). 
Choanopoma trochleare (p. 13). 
Fischer and Crosse (Miss. Scient. Mex., Moll. ii. p. 182) treat their C, chiapasense as 
distinct from C. ¢rochleare, and mention the latter (oc. cit. p. 214) as a doubtful species 
of the genus Cistula, according to Pfeiffer®?. They state that C. trochleare, Reeve, 
